30 C.F.R. § 57.22231 Actions at 0.25 percent methane (I-B, II-B, V-B, and VI mines).
Title 30 - Mineral Resources
If methane reaches 0.25 percent in the mine atmosphere, changes shall be made to improve ventilation, and MSHA shall be notified immediately.
Title 30: Mineral Resources
PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
Subpart T—Safety Standards for Methane in Metal and Nonmetal Mines
Ventilation
§ 57.22231 Actions at 0.25 percent methane (I-B, II-B, V-B, and VI mines).
